DOMETIC Toilet Freshen Up Kit. This toilet freshen up kit makes your toilet shine like new, extending the life of your existing toilet. Replacement waste cassette for DOMETIC CT3000 and CT4000 toilets, ideal for used vehicles. This kit includes a brand-new waste cassette for safe, hygienic waste storage, a replacement toilet seat and lid for a clean, fresh look and a tub of Dometic toilet tabs, ensuring effective odour control and easy waste breakdown from the first use.